#include <iostream>
#include <stdlib.h>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <stdlib.h>
#include <iomanip>
struct BigInt{
    const static int mod = 10000;
    const static int DLEN = 4;
    int a[60000],len;
    BigInt(){
        memset(a,0,sizeof(a));
        len = 1;
    }
    BigInt(int v){
        memset(a,0,sizeof(a));
        len = 0;
        do{
            a[len++] = v%mod;
            v /= mod;
        }while(v);
    }
    BigInt(const char s[]){
        memset(a,0,sizeof(a));
        int L = strlen(s);
        len = L/DLEN;
        if(L%DLEN)len++;
        int index = 0;
        for(int i = L-1;i >= 0;i -= DLEN){
            int t = 0;
            int k = i - DLEN + 1;
            if(k < 0)k = 0;
            for(int j = k;j <= i;j++)
                t = t*10 + s[j] - '0';
            a[index++] = t;
        }
    }
    BigInt operator +(const BigInt &b)const{
        BigInt res;
        res.len = std::max(len,b.len);
        for(int i = 0;i <= res.len;i++)
            res.a[i] = 0;
        for(int i = 0;i < res.len;i++){
            res.a[i] += ((i < len)?a[i]:0)+((i < b.len)?b.a[i]:0);
            res.a[i+1] += res.a[i]/mod;
            res.a[i] %= mod;
        }
        if(res.a[res.len] > 0)res.len++;
        return res;
    }
    BigInt operator *(const BigInt &b)const{
        BigInt res;
        for(int i = 0; i < len;i++){
            int up = 0;
            for(int j = 0;j < b.len;j++){
                int temp = a[i]*b.a[j] + res.a[i+j] + up;
                res.a[i+j] = temp%mod;
                up = temp/mod;
            }
            if(up != 0)
                res.a[i + b.len] = up;
        }
        res.len = len + b.len;
        while(res.a[res.len - 1] == 0 &&res.len > 1)res.len--;
        return res;
    }
    friend std::ostream& operator <<(std::ostream& ostr, const BigInt& in)
    {
        ostr<<in.a[in.len-1];
        for(int i = in.len-2; i>=0; i--)
            ostr<<std::setw(4)<<std::setfill('0')<<in.a[i];
        return ostr;
    }
    void output(){
        printf("%d",a[len-1]);
        for(int i = len-2;i >=0 ;i--)
            printf("%04d",a[i]);
        printf("\n");
    }
};

int main()
{
    int n;
    while (std::cin>>n) {
        BigInt val(1);
        for(int i = 1; i <= n; i++)
            val=val*BigInt(i);
        std::cout<<val<<std::endl;

    }

    return 0;
}
